Dequeueing events was is entirely possible even if none are subscribed,
leading to sleeping indefinitely. Fix this by returning -ENOENT when no
events are subscribed.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-event.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-event.c b/drivers/media/v4l2-core/v4l2-event.c
index b53897e..553a800 100644
--- a/drivers/media/v4l2-core/v4l2-event.c
+++ b/drivers/media/v4l2-core/v4l2-event.c
@@ -77,10 +77,17 @@ int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
mutex_unlock(fh->vdev->lock);
do {
- ret = wait_event_interruptible(fh->wait,
- fh->navailable != 0);
+ bool subscribed;
+ ret = wait_event_interruptible(
+ fh->wait,
+ fh->navailable != 0 ||
+ !(subscribed = v4l2_event_has_subscribed(fh)));
if (ret < 0)
break;
+ if (!subscribed) {
+ ret = -EIO;
+ break;
+ }
ret = __v4l2_event_dequeue(fh, event);
} while (ret == -ENOENT);
--
1.8.3.2
--
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